Might sell my 2.5" and 3.5" HDD and just pick up one large 2TB or 3TB instead. How should I clean my HDD to ensure no one can steal whatever data I got? No there's no porn or anything, but just wondering. Only thing I can think of is to use Acronis, which I believe has a data destruction app.

As for migrating data from the two HDDs into one big HDD, how should I do that as well? I've always just copied and pasted in Windows Explorer.